1. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
2. A spring material should have low
3. Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
4. Alloy powder manufactured by the following process have spherical shapes.
5. Fire refining process is employed in case of
6. Hot extrusion process is not used for making
7. Addition of beryllium to copper is done mainly to produce a/an __________ alloy.
8. In __________ process, ions of salts react with water to produce acidity or alkalinity.
9. Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.
10. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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- Chemical Engineering Basics - Section 13